<clear> Element for <listeners> for <source>
Clears the Listeners collection for a trace source.
<configuration> Element
<system.diagnostics> Element
<sources> Element
<source> Element
<listeners> Element for <trace>
<clear> Element for <listeners> for <source>
<clear/>
Attributes and Elements
The following sections describe attributes, child elements, and parent elements.
Attributes
None.
Child Elements
None.
Parent Elements
Element |
Description |
|---|---|
configuration |
The root element in every configuration file used by the common language runtime and .NET Framework applications. |
system.diagnostics |
Specifies trace listeners that collect, store, and route messages and the level where a trace switch is set. |
sources |
Contains trace sources that initiate tracing messages. |
source |
Specifies a trace source that initiates tracing messages. |
listeners |
Specifies listeners that collect, store, and route messages. |
Remarks
The <clear> element removes all listeners from the Listeners collection for a trace source, including the DefaultTraceListener. You can use the <clear> element before using the <add> element to be certain there are no other active listeners in the collection.
Configuration File
This element can be used in the machine configuration file (Machine.config) and the application configuration file.
Example
The following example shows how to use the <clear> element before using the <add> elements to add the listeners console and textListener to the Listeners collection for the trace source TraceSourceApp.
<configuration>
<system.diagnostics>
<sources>
<source name="TraceSourceApp" switchName="sourceSwitch"
switchType="System.Diagnostics.SourceSwitch">
<listeners>
<clear/>
<add name="console"
type="System.Diagnostics.ConsoleTraceListener"/>
<add name="textListener"/>
</listeners>
</source>
</sources>
<sharedListeners>
<add name="textListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="myListener.log"/>
</sharedListeners>
<switches>
<add name="sourceSwitch" value="Warning"/>
</switches>
</system.diagnostics>
</configuration>